The optimum tilt angle for flat-plate solar collectors in Iran

2012 ◽  
Vol 4 (1) ◽  
pp. 013118 ◽  
Author(s):  
Farzad Jafarkazemi ◽  
S. Ali Saadabadi ◽  
Hadi Pasdarshahri
Keyword(s):  
Flat Plate ◽  
Tilt Angle ◽  
Solar Collectors

scholarly journals Heat Removal Factor in Flat Plate Solar Collectors: Indoor Test Method

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2783
Author(s):  
Orlando Montoya-Márquez ◽  
José Flores-Prieto
Keyword(s):  
Flat Plate ◽  
Tilt Angle ◽  
Heat Removal ◽  
Test Method ◽  
Electrical Heating ◽  
Inlet Temperature ◽  
Solar Collectors ◽  
Linear Behavior ◽  
Useful Heat ◽  
Overall Heat Loss Coefficient

This paper presents a couple of methods to evaluate the heat removal factor FR of flat plate solar collectors, as well as a parametric study of the FR against the tilt angle β, and (Ti − Ta)/G, and its effects on the a0-factor (FRτα) and the a1-factor (FRULmin). The proposed methods were based on indoor flow calorimetry. The first method considers the ratio of the actual useful heat to the maximum useful heat. The second takes into account the slopes of the family of efficiency curves (FRULmin) according to ANSI/ASHRAE 93-2010, and the minimum overall heat loss coefficient, ULmin. In both methods, a feedback temperature control at collector inclinations from horizontal to vertical allows the inlet temperature and the emulating of the solar radiation to be established by electrical heating. The performance of the methods was determined in terms of the uncertainty of the FR. Method 1 allowed a three-fold improved precision compared to Method 2; however, this implied a more detailed experimental setup. According to the first method, the effects of the tilt angle β, and the (Ti − Ta)/G, on the a0-factor were considerable, since FR is directly proportional to the a0-factor. The changes in (Ti − Ta)/G caused an average change in FR of 32% The FR shows almost linear behavior for inclinations from horizontal to vertical with a 14.5% change. The effects of β on the a1-factor were not considerable, due to the compensation between the increase in FR and the decrease in ULmin as β increased.

Thermal and mechanical performance of sealed, gas-filled, flat plate solar collectors

Solar Energy ◽  
2012 ◽  
Vol 86 (1) ◽  
pp. 13-25 ◽  
Author(s):  
Johan Vestlund ◽  
Jan-Olof Dalenbäck ◽  
Mats Rönnelid
Keyword(s):  
Flat Plate ◽  
Mechanical Performance ◽  
Solar Collectors

scholarly journals Economic Feasibility of Flat Plate vs Evacuated Tube Solar Collectors in a Combisystem

2016 ◽  
Vol 91 ◽  
pp. 477-485 ◽  
Author(s):  
Mario Nájera-Trejo ◽  
Ignacio R. Martin-Domínguez ◽  
Jorge A. Escobedo-Bretado
Keyword(s):  
Flat Plate ◽  
Economic Feasibility ◽  
Solar Collectors ◽  
Evacuated Tube

Development of solar testing station for flat-plate water-cooled solar collectors

2004 ◽  
pp. 109-118
Author(s):  
Emin Kulic ◽  
Sadjit Metovic ◽  
Haris Lulic ◽  
Muhamed Koric
Keyword(s):  
Flat Plate ◽  
Solar Collectors

scholarly journals An experimental study of the thermal performance of the square and rhombic solar collectors

2018 ◽  
Vol 22 (1 Part B) ◽  
pp. 487-494 ◽  
Author(s):  
Aminreza Noghrehabadi ◽  
Ebrahim Hajidavaloo ◽  
Mojtaba Moravej ◽  
Ali Esmailinasab
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Performance ◽  
Thermal Efficiency ◽  
Solar Collectors ◽  
Heating Systems ◽  
Solar Water Heating

Solar collectors are the key part of solar water heating systems. The most widely produced solar collectors are flat plate solar collectors. In the present study, two types of flat plate collectors, namely square and rhombic collectors are experi?mentally tested and compared and the thermal performance of both collectors is investigated. The results show both collectors have the same performance around noon (?61%), but the rhombic collector has better performance in the morning and afternoon. The values for rhombic and square collectors are approximately 56.2% and 53.5% in the morning and 56.1% and 54% in the afternoon, respectively. The effect of flow rate is also studied. The thermal efficiency of rhombic and square flat plate collectors increases in proportion to the flow rate. The results indicated the rhombic collector had better performance in comparison with the square collector with respect to the mass-flow rate.

scholarly journals Performance of Flat Plate Solar Collectors using Different Thickness of Glazing Material

2020 ◽  
Vol 8 (6) ◽  
pp. 5787-5793
Keyword(s):  
Flat Plate ◽  
Solar Collectors ◽  
Time Duration ◽  
Varying Thickness ◽  
Different Thickness

This paper throws light on the research of the outcome of breadth of glazing material such as glass on the flat plate solar saver presentation. There are 4 models of the solar saver comprised with varying thickness of glass which are investigated experimentally. The area of the collector fabricated is 0.72x0.15 meters. The thickness parameters considered in the study is low glass iron having the values of 2mm, 3mm, 4mm and 5mm. these materials are used as the glazing material in the present setup. The performance regarding the collector was evaluated and contrasted with the 5mm thickness glass. The result depicted that thickness material having 4mm value has the best results in the time duration considered in the study from morning 7:30 am to evening 6 pm. The effectiveness calibrated showed that 4mm glass gave 35.98% in comparison to the 5mm which incorporated 28.2%.

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